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Finding the Fourth Proportional to 8,920.11, 12,309.57 and 4,941.21

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Solution

The fourth proportional to 8,920.11, 12,309.57 and 4,941.21 is: 6,818.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.11 : 12,309.57 = 4,941.21 : x
  2. Step 2: Convert to fraction form
    8,920.11/12,309.57 = 4,941.21/x
  3. Step 3: Cross multiply
    8,920.11x = 12,309.57 × 4,941.21
  4. Step 4: Simplify right side
    8,920.11x = 60,824,170.38
  5. Step 5: Solve for x
    x = 60,824,170.38/8,920.11
  6. Step 6: Final answer
    x = 6,818.77

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Half scale
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Double scale
Find fourth proportional to 8,921.11, 12,310.95 and 4,942.21
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.